Author Topic: B.I.B at what velocity  (Read 2549 times)

VICIOUS

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B.I.B at what velocity
« on: December 17, 2014, 03:08:07 PM »
 HI Gang;
            So how slow can you let a lead bullet (230 round nose in 45 acp) go before you run the danger of sticking a bullet in the barrel?
  What about a copper washed bullet, is there a difference?
I am looking to getting less recoil to compete with 9 MM using my 45 acp, I just need to be over 125 power factor.

Blackfoot

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Re: B.I.B at what velocity
« Reply #1 on: December 17, 2014, 04:39:18 PM »
Lot of factors could be involved.  My suggestion is use the starting load from a reloading manual. To make 125 pf you need about 550fps.   After that, you are on your own!!

Blackfoot 8)
« Last Edit: December 17, 2014, 04:43:09 PM by Blackfoot »
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John Boy

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Re: B.I.B at what velocity
« Reply #2 on: December 17, 2014, 06:43:29 PM »
Quote
I am looking to getting less recoil to compete with 9 MM using my 45 acp, I just need to be over 125 power factor.
Vicious, here's a PF calculator for the how to Cx
http://www.jbmballistics.com/cgi-bin/jbmpf-5.1.cgi
Using the calculator with a published powder charge of 3.5gr of Trail Boss, the PF is 151.3    
Here's the source for the reload ... http://www.reloadammo.com/45loads.htm
Once you've fiddled with the low PF, the open question then is ... will it consistently eject the spent case and put the bolt into battery for the next round
http://animagraffs.com/how-a-handgun-works-1911-45/

658 fps is the velocity that generates the 151 PF with a 230gr Pb bullet & TB powder charge
A 550fps velocity generates a Power Factor of 126.5
« Last Edit: December 17, 2014, 07:17:08 PM by John Boy »
Regards
John Boy

Garrison Joe

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Re: B.I.B at what velocity
« Reply #3 on: December 17, 2014, 09:17:16 PM »
You do realize that it would be easier to run a lighter bullet at 125 PF than a 230 grain?  Making that PF and still getting the 1911 to cycle would most likely be fairly easy if you go to a 200 grain or even a 185 grain slug.    But 230 may be a challenge.

Bullseye target guns have been run with 185 grains at about 700 FPS, or 129 PF, for years.   Sometimes by dropping the recoil spring to around 12 pounds and mainspring to about 18 pounds, and a judicious amount of smoothing.

Good luck, GJ

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VICIOUS

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Re: B.I.B at what velocity
« Reply #4 on: December 19, 2014, 03:00:31 PM »
HI Gang; G.J. there is a gun show this Sunday so I will be looking for 185 RNHB copper washed for a test run before ordering from a local on line shipper. There already is a wolf spring order at customs that includes a 12 pound recoil spring as well as various others. I currently run a 19 pound main spring in the 1911s. Nice to know that 185, at 700ish has been a target load. The wife has a colt gold cup, this could be good for her. Following the cowboy light bullet for less recoil idea.
Thank You all for the help.
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